My first legendary was Empoleon in Diamond. It was before I knew that Pokemon reached level 100, and I kinda shrugged it off. One thing that I do hate about my past self, is that I traded that Empoleon...... for a level 24 Piplup with some weird Japanese name. The only other Level 100's are ones I got on Sapphire (Blaziken and Rayquaza) and traded to LeafGreen where they currently reside.